NEET 2019 Odisha · PhysicsManometerPrevious Year Question
In a U-tube, water and oil are in the left and right arms respectively. The heights of the water and oil columns (measured from the bottom) are 15 cm and 20 cm respectively. The density of the oil is: (take ρ_water = 1000 kg m⁻³)
Answer: (B) 750 kg m⁻³. Pressure balance at the bottom: ρ_water·g·(15) = ρ_oil·g·(20) ρ_oil = 1000 × 15/20 = 750 kg m⁻³.
- A.1200 kg m⁻³
- B.750 kg m⁻³✓
- C.1000 kg m⁻³
- D.1333 kg m⁻³
Correct Answer
(B) 750 kg m⁻³
Solution & Explanation
Pressure balance at the bottom: ρ_water·g·(15) = ρ_oil·g·(20) ρ_oil = 1000 × 15/20 = 750 kg m⁻³.
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